The fame of this shape, which was a prime example of the Elongated Hexagonal Shape. It had been used in dozens of species over the course of alf a century, with most of those latter-day pencils bearing the name of Try-Rex. It has been a great shape, which it was the original Triangular Pencil, which conformed to people's hands, which added to its popularity. As seen on many of the pencils, the indicate that the shape is patented, as seen in this cutout from the Vivichrome (see image below). Some earlier models say 'Pat. Applied For'.[2]